Stop-motion device.



No. 670,l63. Patented Mar..I9, I90].

W. N. PARKES.

STOP MOTION DEVICE.

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No. 670,l63. Patehted Mar. I9, mm.

N. PABKES.

STOP MOTION DEVICE. (Application filed Jan. 13, 1900.; (No Model.) 3 Sheets-Sheet 2.

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STOP MOTION OEVIOE.

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UNrrnn STATES PATENT ()FFICE.

IVILLIAM N. PARKES, OF BROOKLYN, NEVVYORK.

STOP-MOTION DEVICE.

SPECIFICATION forming part of Letters Patent No. 670,163, dated March 19, 1901.

Original application filed May 18, 1899, Serial No. 717,292.

To aZZ whom, it may concern:

Be it known that 1, WILLIAM N. PARKES, a citizen of the United States of America, residing at the borough of Brooklyn, New York city, county of Kings, and State of New York, have invented new and useful Improvements in Stop-Motion Devices, of which the follow ing is a specification.

On May 18, 1899, I filed an application for a patent on a sewingmachine, Serial No. 717,292,0f which this application is a division.

My invention relates to stop-motions for sewing-machines, and has for its main object improved means for tripping stop-motions into action.

On October 10, 1899, I filed an application for a patent on a stopmotion, Serial No. 733,226. My present invention is shown in connection with that stop-motion.

In the accompanying drawings, Figure 1 is a rear end view of a machine embodying my invention, and Fig. 2 is a side view of the same. Fig. 3 is a horizontal section on line mm, Fig. 2. Fig. 4 is a section on line y y, Fig. 1. Figs. 5, 6, and 7 are details of the tripping device of the stop-motion. Fig. 8 shows the latch and catch of the stop motion before it is tripped into action, and Fig. 9 shows the same after the stop-motion has been tripped into action. Fig. 10 is a detail of the tripping device.

As the stop-motion in which my improvement is shown is all located at the rear end of the machine only, this portion of the machine is illustrated in the drawings.

In the drawings, A designates the arm, and B the bed-plate, of the machine. A drivingwheel 1 is attached to the upper shaft (not shown) of the machine, and a driving pulley or wheel 2 is loosely mounted on the end of the said shaft. The wheel 2 is adapted to clutch the wheel 1 when pushed into engagement with the same. A lever 3, pivoted on a stud 4, which stud has a seat in the arm of the machine, is adapted at its upper end to push the wheel 2 into engagement with the wheel 1 when the said upper end of the lever is turned in the direction of the arrow shown thereon. A friction-strap 5, one end of which is attached to the lever 3 and the other end to a bracket attached to the arm A of the machine,

Divided and this application filed January 13, 1900. Serial (No model.)

is adapted to clutch the wheel 1. A spring 6 is at one end attached to the lower end of the lever 3 and at its other end adjustably to a bracket 7, which bracket is attached to the bed B of the machine. A latch 8 anda catch 9, having a notch 9* formed thereon, normally hold the lever 3 in the position shown in Fig. 1 against the action of the spring 6. When the lever 3 is in this position, the latch and catch are in the position shown in Fig. 8. One end of a small lever 10 is pivoted on a ratchet-wheel l1 and is adapted to engage the end of the latch 8 and lift it out of the notch 9* in the catch 9.

The latch 8 is made of a flat spring, the rear end of which is thickened and pivoted at 8* to a suitable bearing, as shown in Figs. 2 and 3. The outer end of the latch, which engages the notch 9* of the catch 9, is thickened or a piece attached thereto. This outer end can be lifted, as shown in dotted outline in Fig. 2.

The thick end of the latch 8 rests in a notch 12, which is formed in a fixed bearing 13. The notch 12 is in line with the notch 9* when the latch and catch are in their normal position. (Shown in Fig. 8.) The notch 12 is for the purpose of guiding the end of the latch 8 and holding the same against the action of the spring 6.

The wheel 11 has a slot 11* formed in it, in which a light spring 12* is located. One end of the spring is attached to the wheel 11 and the other to apin projecting downwardly from the lever 10 into the slot 11*, the pin by coming into contact with the sides of the said slot limiting the movement of the lever. When the end of the lever 10 comes into engagement with the latch 8 through therotation of the wheel 11, the said lever turns on its pivot against the action of the spring 12* until the pin projecting from the lever comes into contact with one side of the slot 11*, when further movement of the wheel 11 lifts the latch out of the notch 9*.

When the latch 8 is lifted out of the notch 9* by the lever 10, it is also lifted out of the notch 12, when the lever 3, under the action of the spring 6, is turned on its pivot, the wheel 2 disengaged from the wheel 1, and the strap 5 closed into engagement with the wheel 1,

and thereby the machine is stopped. As this movement takes place the catch 9 is moved in the direction of its length, which brings an abutment 10*, formed on the catch 9, into engagement with the latch 8 and turns the said latch on its pivot an extent sufficient to remove it from the path of the end of the lever 10, when the said lever, under the action of the spring 12*, returns to its normal position, which removes its outer end from the path of the latch 8 when returning to its normal position in the notches of the catch 9 and the bearing 13. The spring part of the latch 8 is slightly bent, so that it normally pushes the outer end of the same down.

The return of the stop-motion to its normal position is as follows: The lever 3 is manually turned on its pivot against the action of the spring 6 until the latch 8 drops into the notches 9* and 12. This movement disengages the strap 5 from the wheel 1 and by an incline which is formed on the upper end of the lever 3 coming into engagement with a suitable projection on the wheel 2 presses the said wheel into engagement with the wheel 1. (See Fig. 2.) A raised portion or abutment 13* on the bearing 13 prevents the latch 8 from being carried by the friction between it and the catch 9 beyond the notch 12 before the notch 9* is coincident with the said notch. As the stop-motion is returned to its normal position the latch 8 comes into contact with the abutment 13* and remains there until the further movement of the stop-motion brings the notch 9* in line with the notch 12, when the latch drops into both notches, and the stop-motion is then held in its normal position, which position is shown in Fig. 1.

The following means operate to trip the stop-motion into action: On or near the outer end of a shaft 14, which is mounted to turn in suitable bearings, is loosely mounted a ratchet-wheel 15, to which is adjustably attached an eccentric or cam 16. A lever 17, one end of which is pivoted at 18, has a portion intermediate its ends broadened. In the said broadened portion a longitudinal opening 19 is formed, as shown in Fig. 5, in which the cam 16 is adapted to operate and engage the said lever, and thereby oscillate it on its pivot. The lever is next to the wheel 15 when in position. The wheel 11 is attached to the shaft 14 and when actuated turns the said shaft. A pawl 20, suitably mounted on the end of the lever 17, is adapted to engage the wheel 11. A crank 21 is in a usual way attached to the end of the lower shaft of the machine. One end of a link 22 is adjustably attached to the crank 21 and the other end to the outer end of a pawl-lever 23, which pawllever is pivoted on the end of the shaft 14. A pawl 24, suitably attached to the end of the pawl-lever 23, is adapted to engage the teeth of the wheel 15. The teeth of the wheels 11 and 15 are inclined in opposite directions. Stop-pawls 25 and 26 are adapted to prevent retrograde movement of the wheels. One rotation of the wheel 15 oscillates the lever 17 once, and thereby operates the pawl 20, which engages the wheel 11. Adjustment of the eccentric or cam 16 toward and from the center of the wheel 15 determines the extent of the stroke of the lever 17, and consequently the number of teeth it will feed through at each stroke of the wheel 11. This means for operating the tripping device of stop-motions enlarges their scope, so that a very large number of stitches can be made before the machine is stopped; also, the mechanism can be set so as to stop the machine after a few stitches have been made. If each of wheels 11 and 15 has two hundred teeth and the stroke of pawls which operate them is the extent of one tooth, it is evident that forty thousand stitches will be made before the machine stops. Of course by having more teeth in the wheels or adding another wheel the number can be indefinitely increased.

The device is especially advantageous in embroidery-machines which operate automatioally or in ornamental-quilting machines.

What I claim as new is- 1. The combination with a stop-motion, of an automatic tripping device comprising a ratchet-wheel, a second ratchet-wheel and means for-operating the same, means whereby the first ratchet-wheel is operated from the movements of the second ratchet-Wheel, and means whereby the stop-motion is tripped from the movement of the first ratchet-wheel.

2. The combination with a stop-motion, of an automatic tripping device comprising a ratchet-wheel, a second ratchet-wheel and means for operating the same, a cam operated by the second ratchet-wheel, means whereby the first ratchet-wheel is operated fromthe movements of the cam, and means whereby the stop-motion is tripped from the movements of the first ratchet-wheel.

3. The combination with a stop-motion, of an automatic tripping device comprising a ratchet-wheel, a second ratchet-wheel and means for operating the same, a pivoted pawllever, means whereby the said pawl-lever is operated from the movements of the second ratchet-wheel,a pawl carried by the pawl-lever adapted to engage the first ratchet-wheel, and means whereby the stop-motion is tripped from the movement of the first ratchet-wheel.

4. The combination with a stop-motion, of an automatic tripping device comprising a wheel, a second wheel, means for intermit-,

tently rotating the said second wheel, means whereby the first wheel is rotated from the movement of the second wheel, and means whereby the stop-motion is tripped from the movement of the first wheel.

5. The combination with a stop-motion, of an automatic tripping device comprising a ratchet-wheel, a second ratchet-wheel and means for operating the same, a pivoted pawllever having an elongated opening 19 formed stones 3 therein, an eccentric carried by the second ratchetwheel adapted to operate in the said opening 19 and thereby oscillate the paWl-lever,apawl mounted on the pawl-lever adapted to engage the first ratchet-wheel, and means whereby the stop-motion is tripped from the movement of the first ratchet-wheel.

6. The combination with a stop-motion, of an automatic tripping device comprising a shaft mounted to turn, a wheel loosely mounted on the said shaft, a second wheel, said second wheel attached to the shaft, means for operating the first wheel, means whereby the second wheel is rotated from the movement of the first wheel, and means whereby the stopmotion is tripped from the movement of the second wheel.

7. The combination with a stop-motion, of an automatic tripping device comprising a shaft adapted to turn, a ratchet-wheel loosely mounted on said shaft,a second ratchet-Wheel, said second ratchet-wheel attached to the said shaft, teeth of the ratchet-wheels inclined in opposite directions, means for rotating the first ratchet-wheel, means whereby the second ratchet-wheel is rotated from the movement of the first ratchet wheel, and means whereby the stopmotion is tripped from the movement of the second'ratchetwheel.

8. In combination in astop-motion for sewing-machines aclutch adapted to engage a moving part of the machine, a catch 9 having a notch 9* formed therein, a connection between the catch 9 and the clutch, a latch 8 for engaging the notch 9*, a device for lifting the latch 8 out of the notch 9* and thereby to move in a vertical plane and a horizontal plane, means whereby the latch holds the clutch in an operative position, a device for moving the latch in a vertical plane and thereby tripping the clutch into action, and means operated from the movement of the stop-motion for moving the latch in a horizontal plane and thereby out of the path of the said device.

10. In combination in a stopmotion, the catch 9 having the notch 9* formed therein, the pivoted latch 8 adapted to engage the notch 9*, the bearing 13 having the notch 12 formed therein for holding the latch 8 from turning on its pivot when in its normal position, and means for lifting the latch 8 out of the notches 9* and 12 and thereby tripping the stop-motion into action.

11. In combination in a sewing-machine, a stop-motion comprisinga clutch adapted to en gage a moving part of the machine, a drivingshaft, a train of mechanism comprising a plurality of ratchet-wheels intermediate the driving-shaft and the aforesaid clutch through which the clutch is tripped into action.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

WILLIAM N. PARKES.

Witnesses:

EUGENIE P. HENDRIOKSON, GEO. W. EISENBRAUN. 

